From: Gerrit Renker Date: Mon, 27 Nov 2006 14:27:55 +0000 (-0200) Subject: [DCCP] ccid3: Remove redundant statements in ccid3_hc_tx_packet_sent X-Git-Tag: v2.6.20-rc1~34^2~40^2~145 X-Git-Url: https://err.no/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=70dbd5b0ef3915f1e018e6437c8db9e999b0d701;p=linux-2.6 [DCCP] ccid3: Remove redundant statements in ccid3_hc_tx_packet_sent This patch removes a switch statement which is redundant since, * nothing is done in states TFRC_SSTATE_NO_SENT/TFRC_SSTATE_NO_FBACK * it is impossible that the function is called in the state TFRC_SSTATE_TERM, since --the function is called, in dccp_write_xmit, after ccid3_hc_tx_send_packet --if ccid3_hc_tx_send_packet is called in state TFRC_SSTATE_TERM, it returns -EINVAL, which means that ccid3_hc_tx_packet_sent will not be called (compare dccp_write_xmit) --> therefore, this case is logically impossible * the remaining state is TFRC_SSTATE_FBACK which conditionally updates t_ipi, t_nom, and t_delta. This is a no-op, since --t_ipi only changes when feedback is received --however, when feedback arrives via ccid3_hc_tx_packet_recv, there is an identical code block which performs the same set of operations --performing the same set of operations again in ccid3_hc_tx_packet_sent therefore does not change anything, since between the time of receiving the last feedback (and therefore update of t_ipi, t_nom, and t_delta), the value of t_ipi has not changed --since t_ipi has not changed, the values of t_delta and t_nom also do not change, they depend fully on t_ipi Signed-off-by: Gerrit Renker Acked-by: Ian McDonald Signed-off-by: Arnaldo Carvalho de Melo --- diff --git a/net/dccp/ccids/ccid3.c b/net/dccp/ccids/ccid3.c index 62c304200e..58f7cac6aa 100644 --- a/net/dccp/ccids/ccid3.c +++ b/net/dccp/ccids/ccid3.c @@ -384,27 +384,6 @@ static void ccid3_hc_tx_packet_sent(struct sock *sk, int more, int len) } else ccid3_pr_debug("%s, sk=%p, seqno=%llu NOT inserted!\n", dccp_role(sk), sk, dp->dccps_gss); - - switch (hctx->ccid3hctx_state) { - case TFRC_SSTATE_NO_SENT: - /* fall through */ - case TFRC_SSTATE_NO_FBACK: - /* t_nom, t_ipi, delta do not change until feedback arrives */ - return; - case TFRC_SSTATE_FBACK: - if (len > 0) { - timeval_sub_usecs(&hctx->ccid3hctx_t_nom, - hctx->ccid3hctx_t_ipi); - ccid3_calc_new_t_ipi(hctx); - ccid3_calc_new_delta(hctx); - timeval_add_usecs(&hctx->ccid3hctx_t_nom, - hctx->ccid3hctx_t_ipi); - } - break; - case TFRC_SSTATE_TERM: - DCCP_BUG("Illegal %s state TERM, sk=%p", dccp_role(sk), sk); - break; - } } static void ccid3_hc_tx_packet_recv(struct sock *sk, struct sk_buff *skb)